Functionally Expanded Phase-Change Memory: Experiments on Light Influence on Threshold Voltage

We describe the first experimental results of a light influence on the threshold voltage Vt in new ternary lead-free telluride compound (labeled as SA1). Reduction of Vt on about 35% in SA1 illuminated by Ar ion laser to compare dark Vt is discovered. More than 10,000 switching cycles without degradation have been recorded. Variation of the laser power allows achieving Vt reduction in SA1 down to 40% from the dark level. This is the largest change of Vt known for amorphous chalcogenides. It opens new horizons for chalcogenide functionally expanded phase change memory. Some ideas about the mechanism of the observed effect, related with the photo-generation of charge carriers and possible mechanisms of transition from OFF state to ON state, are discussed

Finding Innovative Technical Solutions in Patents Through Improved Evolution Trends

Abstract Patents represent a reservoir richly endowed with exploitable technical information, where a structured exploration of inventions can unveil essential knowledge for solving industrial problems. Several authors exploit patents using the evolution laws of the TRIZ theory to anticipate technological leaps, categorize patents in a TRIZ perspective, forecast technology, etc. TRIZ laws can be completed with Polovinkin’s rules, design rules, better known as “design heuristics,” and the rules of the art of engineering (engineering best practices). In this chapter, we propose evolution trends composed of all these elements and presented in the form of cards to assist users. After selecting pertinent patents, they can be classified into discovery matrices and analyzed in a timeline classification structured according to their technological branches. The evolution trends enable us to decipher the evolution in inventions being followed or to be followed by each technological branch. An in-depth analysis of several technological branches linked to the technical problem in question allows us to inspire users with original ideas, identify opportunities for innovation, and propose hybrid solutions. To illustrate our approach, we look for possible evolutions of current, deep offshore biphasic separation systems